package com.example.concurrency.example.atomic;

import com.example.concurrency.annoations.ThreadSafe;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
import java.util.concurrent.atomic.AtomicLong;

@Slf4j
@ThreadSafe
public class AtomicExample2 {

    // 请求总数
    public static int clientTotal = 5000;

    // 同时并发执行的线程数
    public static int threadTotal = 200;

    public static AtomicLong count = new AtomicLong(0);

    public static void main(String[] args) throws Exception{

        // 线程池
        ExecutorService executorService = Executors.newCachedThreadPool();
        // 定义并发量
        final Semaphore semaphore = new Semaphore(threadTotal);
        //  定义闭锁
        final CountDownLatch countDownLatch = new CountDownLatch(clientTotal);
        for (int i = 0; i < clientTotal ; i++) {
            executorService.execute(() -> {
                try {

                    semaphore.acquire();
                    add();
                    semaphore.release();
                } catch (Exception e) {
                    log.error("execption", e);
                }
                countDownLatch.countDown();
            } );
        }
        countDownLatch.await();
        log.info("count:{}",count);
    }

    private static  void add(){

        // 先做增加操作，再获取当前值
        count.incrementAndGet();

        // 先获取当前值，在进行添加操作
        //count.getAndIncrement();
    }
}
